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50 to 85 percent.
In modern times - up to 1975 at least - 70% of the Earth's Oxygen {O2} is produced exclusively by phytoplankton.
The oxygen is produced by phytoplankton in the top layers of the Ocean, especially by desmids, diatoms and dinoflagellates---tiny single Celled organisms with shells made of 'glass'.
What else can I help you with?
What do plants give us back when you give them oxygen?
Plants release oxygen through a process called photosynthesis, where they use sunlight, water, and carbon dioxide to produce sugars for energy. The oxygen released during photosynthesis is essential for human and animal respiration, providing the air we need to breathe.
What do plants give us and what do you give them?
Plants are used for many things, including oxygen, food, medicine, and clothing. Shelter, oil, gas, wood, building materials, and water are also things that plants give the world.
What two oceans separate the us from much of the world?
The main oceans are the Atlantic Ocean, and the Pacific Ocean.
Do trees give us oxygen in the winter?
Evergreens ... yes, a little. Desiduous trees, no.
How can forests help people?
yes because the forest has trees and trees give us oxygen
What type of resources did the ocean give us?
Foods, metals, transportation, energy and oxygen.
How much oxygen does one piece of paper give us?
None. It's an inert object.
Are trees helpful?
Yes they are they give us paper and they give us oxygen
What 5 example of what plants give us?
plants give us oxygen
What do the plants give us?
plant give us air or oxygen in scientific called
What is at the foundation of the ocean food chain gives us oxygen?
phytoplankton
How emportant is nature to us?
Nature is helpful in many ways, trees give us oxygen to breathe, bees pollinate flowers to give us fruit, swallows stop us getting overrun by flies, its way too much to say in one wikianswer! XD
What helps us live?
The oxygen that plants give us and our lungs
How plants are useful?
They give us oxygen, and help us to stay alive without plants we wouldnt be alive
How trees give us oxygen?
Its their waste product.
Why flowers should be conserved?
they give us oxygen
Why is is algae so important?
they give us oxygen
